Yaojun Li, Jie Feng, Wenzhao Wang, Junhao Tan, Xulei Ge, Feng Liu, Wenchao Yan, Guoqiang Zhang, Changbo Fu, Liming Chen. Micro-size picosecond-duration fast neutron source driven by a laser–plasma wakefield electron accelerator[J]. High Power Laser Science and Engineering, 2022, 10(5): 05000e33
- High Power Laser Science and Engineering
- Vol. 10, Issue 5, 05000e33 (2022)
Fig. 1. Experimental setup. (a) Schematic diagram of photo-nuclear reactions for 
Ag and 
Ag atoms. (b) 
Ag decay products, and schematic diagram of the measurement of neutron source spatial distribution.
Ag and Ag atoms. (b) Ag decay products, and schematic diagram of the measurement of neutron source spatial distribution. 
Fig. 2. Experimental results of the electron beam at plasma density of 3.68
cm
. (a) Electron beam angular distribution (PSL value). (b) Electron beam energy spectrum of 10 continuous shots. (c) Electron beam divergence angle of 70 continuous shots. (d) Electron beam charge.
cm. (a) Electron beam angular distribution (PSL value). (b) Electron beam energy spectrum of 10 continuous shots. (c) Electron beam divergence angle of 70 continuous shots. (d) Electron beam charge. 
Fig. 3. Experimental results of neutron source spatial distribution. (a) Positron distributions of eight-piece silver plates. (b) Deduced neutron source on-axis distribution from the first silver plate. (c) Variation of neutron source size and positron charge with silver converter depth.
Fig. 4. Optimized results of neutron source size. (a) Positron distribution comes from the front side of the Ag converter with 500 μm thickness. (b) Positron distribution comes from the back side. (c) Neutron time of flight spectrum. (d) Neutron energy spectrum.
Fig. 5. Energy resolutions for different neutron pulse durations: (a) 1 ns; (b) 36 ps.
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